Human skeletal muscle fiber type-specific responses to sprint interval and moderate-intensity continuous exercise: acute and training-induced changes
Lauren E. Skelly, Jenna B. Gillen, Barnaby P. Frankish, Martin J. MacInnis, F. Elizabeth Godkin, Mark A. Tarnopolsky, Robyn M. Murphy, Martin J. Gibala
Abstract
We examined mixed-muscle and fiber type-specific responses to a single session and to 12 wk of moderate-intensity continuous training (MICT) and sprint interval training (SIT) in humans. Both interventions elicited generally similar responses, although the training-induced increases in type I fiber-specific markers of mitochondrial content were greater in MICT than in SIT. These findings advance our understanding of the potential role of fiber type-specific changes in determining the human skeletal muscle response to intermittent and continuous exercise.
Topics & Concepts
SprintInterval trainingContinuous trainingHigh-intensity interval trainingMuscle fibreMedicineSkeletal muscleFiber typePhysical therapyPhysical medicine and rehabilitationIntensity (physics)FiberInternal medicineEndocrinologyChemistryQuantum mechanicsOrganic chemistryPhysicsCardiovascular and exercise physiologySports Performance and TrainingAdipose Tissue and Metabolism